Header 大小超过了固定的最大大小

Question

我有一个 SAP HCI 场景，我最后发送了一封附有 XML 回复的电子邮件。尽管文件大小为 20kb，并且只有一个接收器，但我还是收到了这个错误。

com.sun.mail.smtp.SMTPSendFailedException: 552 5.3.4 Header 大小超过固定的最大大小

Answer 1

好的，我明白了：

这是 SMTP 适配器 channel-specific 配置。按照设计，开发人员必须选择附件的来源，header 是唯一好的选择（不是属性，很遗憾）。

CPI 消息的所有 headers 都被传输到 SMTP（对我来说是糟糕的设计），因此您的限制是由于指定的附件或任何其他 header。

为了证明我的假设，我创建了两个 header：aa 的长度较小，ab 的长度较长：

msg.setHeader('aa', "<?xml version='1.0'?><root>" + "a"*256 + "</root>")
msg.setHeader('ab', "<?xml version='1.0'?><root>" + "a"*1024*30 + "</root>")

然后，我将邮件发送到 cloud-internal SMTP，并收到退回邮件：

This message was created automatically by the SMTP relay on XXXXXXXXXXXXXXXX.

A message that you sent could not be delivered to all of its recipients.
The following address(es) failed:

  ilya.kuznetsov@domain
    SMTP error from remote mail server after MAIL FROM:<ilya.kuznetsov@domain> SIZE=4019:
    host XXXXXXXXXXXX [1.1.1.1]: 550 Administrative prohibition 2017-11-03-121-56439fc44a7dc0b43c28074ed7efe877

------ This is a copy of the message, including all the headers. ------

Return-path: <ilya.kuznetsov@domain>
...
Date: Fri, 3 Nov 2017 12:00:20 +0000 (UTC)
From: ilya.kuznetsov@domain
To: ilya.kuznetsov@domain
Subject: Hello world 2017-11-03T12:00:19.019Z
MIME-Version: 1.0
Content-Type: multipart/mixed; 
    boundary="----=_Part_69_482225443.1509710419985"
aa: <?xml version='1.0'?><root>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</root>
ab: <?xml version='1.0'?><root>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</root>
SAP_MessageProcessingLogID: AFn8WlOMHKwYXS0KJbCcva0BG9Wh
SAP_MplCorrelationId: AFn8WlOmx_9yZFXocsPbBYIjesC9
SAP_PregeneratedMplId: AFn8WlPK-r5wMnCqVPDM-nHhsvmo
scriptFile: Whosebug_47077818.groovy
scriptFileType: groovy

------=_Part_69_482225443.1509710419985
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

Hello world body
------=_Part_69_482225443.1509710419985
Content-Type: application/xml; name=aa
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename=aa

<?xml version='1.0'?><root>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</root>
------=_Part_69_482225443.1509710419985--

因此，如您所见，在 SMTP session 期间传输的信件未使用的无关 header 可能是您出错的原因。

更好的方法是使用带有纯 Javamail 代码的简单 Groovy 脚本。

Header 大小超过了固定的最大大小

Header size exceeds fixed maximum size

email

size

sap

cloud-integration